General
Diclofenac sodium delayed-release tablets, cannot be expected to
substitute for corticosteroids or to treat corticosteroid insufficiency. Abrupt
discontinuation of corticosteroids may lead to disease exacerbation. Patients on
prolonged corticosteroid therapy should have their therapy tapered slowly if a
decision is made to discontinue corticosteroids.
The pharmacological activity of diclofenac sodium delayed-release tablets in
reducing fever and inflammation may diminish the utility of these diagnostic
signs in detecting complications of presumed noninfectious, painful
conditions.
Hepatic Effects
Borderline elevations of one or more liver tests may occur in up
to 15% of patients taking NSAIDs including diclofenac sodium delayed-release
tablets. These laboratory abnormalities may progress, may remain unchanged, or
may be transient with continuing therapy. Based on this experience, in patients
on chronic treatment with diclofenac sodium delayed-release tablets, periodic
monitoring of transaminases is recommended (see PRECAUTIONS: Laboratory
Tests). Notable elevations of ALT or AST (approximately three or more
times the upper limit of normal) have been reported in approximately 2%-4% of
patients, including marked elevations (eight or more times the upper limit of
normal) in about 1% of patients in clinical trials with diclofenac. In addition,
rare cases of severe hepatic reactions, including jaundice and fatal fulminant
hepatitis, liver necrosis and hepatic failure, some of them with fatal outcomes
have been reported.
A patient with symptoms and/or signs suggesting liver dysfunction, or in whom
an abnormal liver test has occurred, should be evaluated for evidence of the
development of a more severe hepatic reaction while on therapy with diclofenac
sodium delayed-release tablets. If clinical signs and symptoms consistent with
liver disease develop, or if systemic manifestations occur (e.g., eosinophilia,
rash, etc.), diclofenac sodium delayed-release tablets should be
discontinued.
Hematological Effects
Anemia is sometimes seen in patients receiving NSAIDs, including
diclofenac sodium delayed-release tablets. This may be due to fluid retention,
occult or gross GI blood loss, or an incompletely described effect upon
erythropoiesis. Patients on long-term treatment with NSAIDs, including
diclofenac sodium delayed-release tablets, should have their hemoglobin or
hematocrit checked if they exhibit any signs or symptoms of anemia.
NSAIDs inhibit platelet aggregation and have been shown to prolong bleeding
time in some patients. Unlike aspirin, their effect on platelet function is
quantitatively less, of shorter duration, and reversible. Patients receiving
diclofenac sodium delayed-release tablets who may be adversely affected by
alterations in platelet function, such as those with coagulation disorders or
patients receiving anticoagulants, should be carefully monitored.
Preexisting Asthma
Patients with asthma may have aspirin-sensitive asthma. The use
of aspirin in patients with aspirin-sensitive asthma has been associated with
severe bronchospasm which can be fatal. Since cross-reactivity, including
bronchospasm, between aspirin and other nonsteroidal anti-inflammatory drugs has
been reported in such aspirin-sensitive patients, diclofenac sodium
delayed-release tablets should not be administered to patients with this form of
aspirin sensitivity and should be used with caution in patients with preexisting
asthma.
Information for Patients
Patients should be informed of the following
information before initiating therapy with an NSAID and periodically during the
course of ongoing therapy. Patients should also be encouraged to read the NSAID
Medication Guide that accompanies each prescription dispensed.
- Diclofenac sodium delayed-release tablets, like other NSAIDs, may cause
serious CV side effects, such as MI or stroke, which may result in
hospitalization and even death. Although serious CV events can occur without
warning symptoms, patients should be alert for the signs and symptoms of chest
pain, shortness of breath, weakness, slurring of speech, and should ask for
medical advice when observing any indicative sign or symptoms. Patients should
be apprised of the importance of this follow-up (see WARNINGS: CARDIOVASCULAR
EFFECTS).
- Diclofenac sodium delayed-release tablets, like other NSAIDs, can cause GI
discomfort and, rarely, more serious GI side effects, such as ulcers and
bleeding, which may result in hospitalization and even death. Although serious
GI tract ulcerations and bleeding can occur without warning symptoms, patients
should be alert for the signs and symptoms of ulcerations and bleeding, and
should ask for medical advice when observing any indicative sign or symptoms
including epigastric pain, dyspepsia, melena, and hematemesis. Patients should
be apprised of the importance of this follow-up (see WARNINGS: Gastrointestinal (GI)
Effects:
Risk of
GI Ulceration, Bleeding, and Perforation).
- Diclofenac sodium delayed-release tablets, like other NSAIDs, can cause
serious skin side effects such as exfoliative dermatitis, SJS, and TEN, which
may result in hospitalizations and even death. Although serious skin reactions
may occur without warning, patients should be alert for the signs and symptoms
of skin rash and blisters, fever, or other signs of hypersensitivity such as
itching, and should ask for medical advice when observing any indicative signs
or symptoms. Patients should be advised to stop the drug immediately if they
develop any type of rash and contact their physicians as soon as possible.
- Patients should promptly report signs or symptoms of unexplained weight gain
or edema to their physicians.
- Patients should be informed of the warning signs and symptoms of
hepatotoxicity (e.g., nausea, fatigue, lethargy, pruritus, jaundice, right upper
quadrant tenderness, and “flu-like” symptoms). If these occur, patients should
be instructed to stop therapy and seek immediate medical therapy.
- Patients should be informed of the signs of an anaphylactoid reaction (e.g.,
difficulty breathing, swelling of the face or throat). If these occur, patients
should be instructed to seek immediate emergency help (see WARNINGS).
- In late pregnancy, as with other NSAIDs, diclofenac sodium delayed-release
tablets should be avoided because it may cause premature closure of the ductus
arteriosus.
Laboratory Tests
Because serious GI tract ulcerations and bleeding can occur
without warning symptoms, physicians should monitor for signs or symptoms of GI
bleeding. In patients on long-term treatment with NSAIDs, including diclofenac
sodium delayed-release tablets, the CBC and a chemistry profile (including
transaminase levels) should be checked periodically. If clinical signs and
symptoms consistent with liver or renal disease develop, systemic manifestations
occur (e.g., eosinophilia, rash, etc.) or if abnormal liver tests persist or
worsen, diclofenac sodium delayed-release tablets should be discontinued.
Drug InteractionsAspirin
When diclofenac sodium delayed-release tablets are administered
with aspirin, its protein binding is reduced. The clinical significance of this
interaction is not known; however, as with other NSAIDs, concomitant
administration of diclofenac and aspirin is not generally recommended because of
the potential of increased adverse effects.
Methotrexate
NSAIDs have been reported to competitively inhibit methotrexate
accumulation in rabbit kidney slices. This may indicate that they could enhance
the toxicity of methotrexate. Caution should be used when NSAIDs are
administered concomitantly with methotrexate.
Cyclosporine
Diclofenac sodium delayed-release tablets, like other NSAIDs, may
affect renal prostaglandins and increase the toxicity of certain drugs.
Therefore, concomitant therapy with diclofenac sodium delayed-release tablets
may increase cyclosporine’s nephrotoxicity. Caution should be used when
diclofenac sodium delayed-release tablets are administered concomitantly with
cyclosporine.
ACE-inhibitors
Reports suggest that NSAIDs may diminish the antihypertensive
effect of ACE inhibitors. This interaction should be given consideration in
patients taking NSAIDs concomitantly with ACE inhibitors.
Furosemide
Clinical studies, as well as post-marketing observations, have
shown that diclofenac sodium delayed-release tablets can reduce the natriuretic
effect of furosemide and thiazides in some patients. This response has been
attributed to inhibition of renal prostaglandin synthesis. During concomitant
therapy with NSAIDs, the patient should be observed closely for signs of renal
failure (see WARNINGS: Renal Effects), as well as to assure diuretic
efficacy.
Lithium
NSAIDs have produced an elevation of plasma lithium levels and a
reduction in renal lithium clearance. The mean minimum lithium concentration
increased 15% and the renal clearance was decreased by approximately 20%. These
effects have been attributed to inhibition of renal prostaglandin synthesis by
the NSAID. Thus, when NSAIDs and lithium are administered concurrently, subjects
should be observed carefully for signs of lithium toxicity.
Warfarin
The effects of warfarin and NSAIDs on GI bleeding are
synergistic, such that users of both drugs together have a risk of serious GI
bleeding higher than users of either drug alone.
PregnancyTeratogenic EffectsPregnancy Category C
Reproductive studies conducted in rats and rabbits have not
demonstrated evidence of developmental abnormalities. However, animal
reproduction studies are not always predictive of human response. There are no
adequate and well-controlled studies in pregnant women.
Nonteratogenic Effects
Because of the known effects of nonsteroidal anti-inflammatory
drugs on the fetal cardiovascular system (closure of ductus arteriosus), use
during pregnancy (particularly late pregnancy) should be avoided.
Labor and Delivery
In rat studies with NSAIDs, as with other drugs known to inhibit
prostaglandin synthesis, an increased incidence of dystocia, delayed
parturition, and decreased pup survival occurred. The effects of diclofenac
sodium delayed-release tablets on labor and delivery in pregnant women are
unknown.
Nursing Mothers
It is not known whether this drug is excreted in human milk.
Because many drugs are excreted in human milk and because of the potential for
serious adverse reactions in nursing infants from diclofenac sodium
delayed-release tablets, a decision should be made whether to discontinue
nursing or to discontinue the drug, taking into account the importance of the
drug to the mother.
Pediatric Use
Safety and effectiveness in pediatric patients have not been
established.
Geriatric Use
As with any NSAIDs, caution should be exercised in treating the
elderly (65 years and older).